SeaForces is a sprawling naval reference site organized around ship classes, submarines, international fleets, naval aviation units, weapons systems, and special reports rather than a modern news-feed interface.
USPaperMoney.Info is a specialist reference for modern U.S. currency production, serial-number ranges, star notes, print runs, block lists, uncut sheets, and the small manufacturing details collectors actually need.
Vic and Debbie Ceder’s Square Dance Resource Net grew into a sprawling collection of calls, clubs, callers, choreography, events, music, cue sheets, and old dance definitions.
Ken Polsson's Mug Shots began in the summer of 1995 as a page about roughly 30 A&W Root Beer mugs and evolved into a collector database with its own classification system, price history, corporate timeline, and decades of revisions.
Jamie Allen's FabPedigree is a gigantic hand-linked genealogy project containing nearly 297,000 pedigree pages, ancient-lineage claims, alternate pedigrees, errata, famous names, and an unusually frank warning not to treat any of it as authoritative.
Oleg Bartunov's old Sternberg Astronomical Institute web directory became a working home for PostgreSQL research and development around GiST, GIN, tsearch2, pg_trgm, hstore and other infrastructure that later became familiar parts of PostgreSQL.
The Bigfoot Field Researchers Organization launched its website in 1995 and built a long-running sightings database with geographic indexes, investigator notes and a Class A/B/C system based on the potential for misidentification.
StarLing's database server preserves searchable etymological, typological and lexicostatistical datasets through a dense CGI interface built for comparative and historical linguistics.
PlaneCrashInfo has been cataloging aviation accidents since the late 1990s, preserving a blunt, hand-built database that reaches back to the earliest years of powered flight.